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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df82442b21011cd1401823927da0721fabdb463dc8373b6719bae1fabc1fc064' 
  AND token = 'nVKE700uoz6voxg32U287n1QsVI28PKuJgL4HBsJX4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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