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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758e0771f1ed79f4f642231017318332c4d1c33e98c49b785409123f102b645f' 
  AND token = 'kXwhn/Jtwu9mOvrK1r1fkhHo6vVeWVz23pv/ml0o0Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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