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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf416459299c1c23761cc8cb0d53fb7c9975c843ce958a4e4275b8587151abdb' 
  AND token = '8YiLu04dJoLHjcYQtSeU8Q+IOhiBH2jQRc2HHhaxcZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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