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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c56b8ec4a447d59062d7083f2c6a39a3302a6264f5939fd221f5314ded42d2' 
  AND token = 'bmxpFZ3dHersXBfHdpwZvd3xQnmm5VRiCeGSerzWCeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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