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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e4986bddeac89dc9b233737fce4c11c1f483fd09120a4b011f82208b616e8d' 
  AND token = 'hLJAyxAM7giGidTRwD0giBUxR8bJeopnbi60Qz/Gx40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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