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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b533fed963d483a945ce8c1d53dedca2b9e68c9d7f2ff13ffde7226f759981ac' 
  AND token = 'Y29ApEGIqLseOsVnRlWzR8d++bSsWvyBPEBIFYySrKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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