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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd797414d4a906da308d55e115a2a1d1193f2915963db264faea65284b7ac812b' 
  AND token = 'NordQmxp7mL2ni57+0ITBGTPQTlCmFfS6FfBcQcYUxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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