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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da251fbf8f703c7694b6c4edaafe94289b1b82330d23fa59c5ff25a4b1b48fd8' 
  AND token = '7/eTiOshYNPi63Tq1+qKx4DAiaIynWB9YFyOUImEEcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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