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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd58eba606ada39b2f983341b091fcd816e33df1cf9b73c56d704672a76db059' 
  AND token = 'DC/XOZPi4DftscOJ0XH/EFul7V8EUdJjOoam3Noko0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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