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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbab1db7c0f99942d7e51bc6572cef611134f2e977213cc2674cb401d090e7d' 
  AND token = 'FUKwpAELBvfvfMDt6/p0lwB5Yvz/ohD89iU1YPQt2jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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