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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efcae013c99fd0f2a99469eee05156b4abd834434b385bae3607630a19e53b3' 
  AND token = 'dYRRz+k3k+A1msltMRVrSYsjaRtG5AmGsc55zhTggv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.07837

JSON explain

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