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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea12eeb562d60253687fa2800fb3a3690acb89633c182aa8bc8ebd841347298' 
  AND token = '/z1qzUfY4Wlvl01VS0jPCDv3Ac9fPe03fRCOKE/u9q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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