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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5954b1e1d6918200897920cf458b0194b500f218de5a898000fb05ffc9cf3ca' 
  AND token = 'IKVu5C89N5c/evFY7PW5cEcn4AV4Xc3kxMixmnkc8y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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