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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb3fb0569f1cc567168bae93ef1c4cbed51e747042ce0eee4b44cb95ffc59bb' 
  AND token = 'q8ChfdS+GsLisdAa8jJYJ/5qaV6ETlp9m4MErV/PBA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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