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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c026d0fefd00ce4e86f1d49c92f62e97ca2a30a4211587061bd54f64e37cb99' 
  AND token = 'zn1D3L5u1C0jHvTO7sXh3d1qschiich6EM22Ley/Rnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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