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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f370ec707f6d2d3044cc4ef898359e625a1fb4e8ef0a6b8f185883df894b980d' 
  AND token = 'R7lgHdL7WtdbdfBXd0HMS58CB5oKfSgLCmLQCFiK3H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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