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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2a1a298a2dc60b958a518d96608f3fb8ad6dabbae821091e9b17ea17ac2d20' 
  AND token = 'YN7CnpsOKfkYy5TCQCNHt4/MGxUCqMDmqmR1Smx9HXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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