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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294c12b243722d9aeed74fd2ca00abe3ad4104160ca99c39484eb11708c810b9' 
  AND token = 'El6t1qO6MLuDttYS6gwM8p5HtPwoksR2a1DxxPKv8jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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