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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2b58b75f5ea1873f8c6563609bd8217f877c4a3329b126ecd673acbb689472' 
  AND token = '8iH7nqC2DJO31b7VBQ6rkrimBayTWBHLIMZJTOBelzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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