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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3bbd4de85964017de1357f7e7f6bbc0f4c4f37257028b134f06e42af7d0431' 
  AND token = 'f3aOmN6DFdxiq9bJddp3I0IuJnojnBWsyA5nVupOdN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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