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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5870941186f5dc70152f56e2f38f5011b3303b8f836e0886eb10426e1ce7fe8' 
  AND token = 'fZNYlPBJMBY1Z+tUUDkAewkvSMCxv0DJF75laXbfqZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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