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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83a63d5b3ab22a2da472dd87f4f3e6fa50279d6203bffb216f6d52fe415313d' 
  AND token = 'ahGcD3lwPt6fWCxR6NadfRGYJHrp2+Gdwszrmf3xNWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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