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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f56a2b45f6cf4483eeb58010795752617609f2ad344ebf0f99d282dd5a39961' 
  AND token = 'zM9AVJzB40J+B4g1FgXCJnzWEK55IoLtVM5fSkQig3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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