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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b0301e8a38dc9bca1b13a20c041d20e87f465d47ab0207a35a3477beeb66e3' 
  AND token = 'AxGVfiyZX3baBXQltL6WgouTA6ItQrhCPEc8rzPCubA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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