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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c048e8ef134bfa7b7d687ecc6c6d906a710a9ff90c82210a3a5585fcaa60ed1' 
  AND token = 'ozODnM1pu1TzzpZHepRM+BEVFeZvbgY+56zv8qgde6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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