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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1cf2e428308edee71460b73c8411db7e9f31eea4480e19e3089c291fb436e7' 
  AND token = 'gTqE+aIaj8tD5NxLSZ5fb91f3A7iPTJqgSTnW8HAc/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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