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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fdc62038bc8aaeb8b55fe8c7c678c152d141c30533785d56229c067d90ef1d' 
  AND token = 'ObFslmwZMX6m2qZyv0XJJ7z7iQAnVOilPNlQ8enVEgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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