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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6227c5a9766ac438274e41e98b91118c4c597087f2e4ad4148aa00deb5f428df' 
  AND token = 'VMCVxkGuEfml5oV4ApP9ooHy21xnRsS01Q8WmoClWhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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