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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1ba752e903319f8f98084c34844a45be4da3aca95ff3f75f2ba9785d97a028' 
  AND token = 'PhKD0OYNc1DK1+P43GursOKPGjHwN92YDd36SMX7/Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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