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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6154ae31d0e2fe417dafbc17c49b2bff34c951d1dc4c3b16b6ec25b96bc831e4' 
  AND token = 'YszMdP5GRRf4VOc4lCoZvZ/kGLfkF/O/4nPuPB8DrB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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