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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dec590465b5a0f800e06f59ad9a6f28d60a137128728bab190c7a5ded924c3' 
  AND token = 'e2dmiLsYt+bCYBYbki4N9xQz3wU7is5jBqFDM6hJztw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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