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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ecd8289bb0f0d1daeab9c754d2944a21ba34d37eeb146ad424dd1a8f13b798b' 
  AND token = 'PNw4JKtXKh7NBG7boA+ncfJwpW1hk7jwgDw4Hxf4dMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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