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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97821c70c51ee3c0c2e195c9c5a9c4f3191721de4f5e622b0d230b89030e90a3' 
  AND token = 'wq18Jk4vXRL9mA0G/7T+BFMCIKiy8C0QHjGm/C103z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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