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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cce6fb0f8964bf5ac5f8fa54c4da6f6297fd57c0677170770f336f50f69a9e' 
  AND token = 'wsVduTMbETCxzRq6sYy7XZjLtjZ96gvbseL9WbZt3+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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