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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46ae6ed355db06af20b37241c7fe397293f804209c5062bce532112bdafeede' 
  AND token = 'kiV4wjZ4p4lhs+VMghMuraFTBtnIiCG/njXIlf6UnOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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