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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ce0381158a43e8b3f8c4f60000d62f663296984a61ee9b6aeb58dde39381cc' 
  AND token = 'jRZG7i4s1DSQbEIeSPjyA8sKiQcL3REXfr/UDgn+Z7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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