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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00899c8b51df329091f778f420897ebbde25c7025e6e976b55c53cdb6e916714' 
  AND token = 'l8/5gQB2V3rgaaVnbtJRwShwuH2pgUXK0O8s5RlUdO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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