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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fab640001da7abf7da62fc12cf29af30efd87ca9e6bb873342fd05bf467d61' 
  AND token = 'NDTc998Z9r0kzxD4BCp4N63eqGAyaymZVh4JRKCthHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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