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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbb52dfb25c3d5a32d68598cd177ecbc9cb74946b6872de80860401ceba90ae' 
  AND token = 'jT5PagSLiRvveyPvfEm2xC7bALJoMHC41+2hW4fEmF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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