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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56274e41b0a2fdad94b35503166d3b0fb80dcf61f66b230f824f69861d4bfd9' 
  AND token = '6xk41eUvbWY1+f37MRYmzqEyK07nkXso0srNgMDQhBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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