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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586093f1b1b8177c09b34fbd982bae25806e2895c745d6df863e30b24da007e4' 
  AND token = 'UWj8wJDvRAOrsYV+LT5XSvcdwjlapp41hPPeJ2s+8Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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