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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8628b0f74bac2e0f036ce17c7fe0a0009a58b091d8e8d27ea59d46206418206' 
  AND token = 'Ni75r9yQt6jGK3JvLOzywRIWTFDzMvM709knvbM8LnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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