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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6611a70bc3d090631991061dfd214ee65597c7e6320fdda890e92ea3113485' 
  AND token = '+W46I5H6oTyK4snppMPwhj98fTJa73VU5Zrc2te6ELA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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