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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27362317fe014274c7646f71b9d7d2339c94dda1c209fad8653d5d2858f3ffa8' 
  AND token = '47yDGnOFR1VMmEseGfVlf2Ydu8DuKmP4FRefe0q9d1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}