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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccb028d47aa41d316192b30e65e47de33be34f71fd522c43de11c989b6750e1' 
  AND token = 'XbtUb4PXJ2ql+ywMqPNYC4P4suOULmkKEJoNV7+f18I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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