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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed3cf2ee8157528c4ffb7b45ec6ae6dd891e6690a7bd63d26ae926bf369ea8be' 
  AND token = 'mFOc9Iv4crUMk8O2fkJEF7DVfG4yV8aD8Jd596QApf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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