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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74eb740a7789f509e1d2762b1ebf758b867b47aa7d1bbfd7808328e72a91f8c3' 
  AND token = '7zbqbr51AAeNT0HbRI2e5bX7rMcvx2S+z02xIP5On3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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