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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11e82e8e8ac07c08114d5420a71e7ae956ba0c671f65b06a618acd58842e31a' 
  AND token = 'TDDX1j28Rr/dsbQMjLlbE4MrgMkrg6igyMEFX3oor/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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