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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c04a4bd3a91cd89d526dc674b2217cc4c6b2ba9941902a32a613c67fb7583b' 
  AND token = 'm2aDOx7+h8nt4K91L/Q/D0+LJFRWdObQq3Mpq309E+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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