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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5159a6597a1a24c4899610547cbe94375143abb07b895d7b584460f53676e97' 
  AND token = 'BZtWiE/ivfsn1DXFU/eA22bTnIAG0FTrAcN3FnwgAyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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