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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3ece8bdea21365a86083ee01bd85d9233a5a1ff309f705f7de4dee9f21ea32' 
  AND token = 'dLveZGfxAM6xX7TXg2NQwb6gE0NORvK4X755es8SOxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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