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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906e5707a2cc63cee7504e64d3fa686a74ce8b8438e136baa08f8e9a4dc1b094' 
  AND token = 'enc7Ac8co0PdRcyStT+CwDOjcpkHd02nv8EFGHhXUA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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