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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab80aa30c758597346afa9fc2200c5ae278f1c627df70092f648493f688d07ab' 
  AND token = 'dXIC7svAjjWLlYb7H+Ra0/Clh/Z/wLPntMtvyts17Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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