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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672d4703b797ab69fe7c876d0c8be1670b9e9e46a975b99e2bb71e561d878159' 
  AND token = 'b92jHqUBkw0lHCwVIGFWY5OzEOQyOP1+YDNvgEIYvKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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