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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f16d2a3d27e458a04f4e3dcc89deb848c46299511ab1d82c02eeb472ffcc8e' 
  AND token = 'e/6cvZ3CJ4oMxuZ90tHQ8YmfIYCZHdDz6ze2ut0uEDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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